A search for renewals was done for publications for the years 1975 and 1976. There were no renewals for the title Radio Mirror, so there's no evidence Macfadden continues to claim on the material.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
{{Information |Description=Photo of Al and Erle Jolson with their adopted son, Asa. |Source=[http://archive.org/stream/radi00mac#page/36/mode/2up Radio Mirror] page 36 |Date=June 1948 |Author=[http://archive.org/stream/radi00mac#page/2/mode/2up Macfadd...